Azure Monitor Agent Heartbeat

Example only

Review and validate before production use. All values below are placeholders.

Problem

A virtual machine stopped sending heartbeat records to Log Analytics.

Environment

• VM: vm-monitoring-01
• Region: westeurope
• Workspace: law-cloudnotes-ops

Quick checks

1. Confirm AMA extension state in Azure portal.
2. Confirm Data Collection Rule association.
3. Verify network path to Azure Monitor endpoints.

KQL validation query

Heartbeat
| where TimeGenerated > ago(1h)
| where Computer == "vm-monitoring-01"
| summarize LastHeartbeat = max(TimeGenerated)

Common cause

The VM was associated with an outdated Data Collection Rule after a policy update.

Solution

• Reassociate the correct Data Collection Rule.
• Restart Azure Monitor Agent service.
• Wait 5 to 10 minutes and rerun the query.

Verification

Heartbeat records resumed and alert noise stopped.